Allow LGPL. Add licenses explicitly. I'm no lawyer, hopefully this is enough.

Nobody will make money on ParmEd, anyway.

README

@@ -24,6 +24,13 @@ along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.
 
+Alternative License
+===================
+
+If the GNU GPL is too restrictive, you are welcome to license ParmEd and its
+components under the GNU Lesser GPL (LGPL).  Copies of both the GNU GPL and the
+GNU LGPL are included in the distribution.
+
 Description
 ===========